import { Scene, Texture, WebGLRenderer } from "three";
/**
 * Compatibility helpers that paper over differences between the classic `WebGLRenderer` and the
 * (experimental) `WebGPURenderer` / node-based renderer family. Keeps backend-specific branching
 * out of the engine core.
 */
/**
 * Minimal PMREMGenerator surface used by the engine — satisfied by both the classic (WebGL)
 * `PMREMGenerator` and the backend-agnostic one used with the `WebGPURenderer`.
 */
export interface IPMREMGenerator {
    fromScene(scene: Scene, sigma?: number, near?: number, far?: number): {
        texture: Texture;
    };
    dispose(): void;
}
/**
 * Registers the backend-agnostic PMREMGenerator class. Called by the engine when it creates the
 * (experimental) `WebGPURenderer`, since `three/webgpu` is dynamically imported there.
 */
export declare function registerWebGPUPMREMGenerator(ctor: typeof import("three/webgpu").PMREMGenerator): void;
/**
 * Creates a PMREMGenerator appropriate for the given renderer. The classic three `PMREMGenerator`
 * is WebGL-only (it reads `renderer.state`); a `WebGPURenderer` (including its `forceWebGL` / WebGL2
 * mode) needs the backend-agnostic one. Dispose the returned generator when done.
 */
export declare function createPMREMGenerator(renderer: WebGLRenderer): IPMREMGenerator;